Add eggs, milk, cream, most of the Parmesan, mustard powder, hot sauce, black pepper, salt and garlic into a blender. Blend until smooth. Pour liquid into a large bowl. 

Submerge each slice of bread in the mixture, one at a time. Shake excess liquid off each slice. 

Heat a non-stick skillet over medium heat. Melt 1 tablespoon butter in hot skillet. Cook French toast for 2 minutes or until lightly browned. Flip and continue cooking until the second side is lightly browned.

Make the Hollandaise Sauce. In a clean blender, add the egg yolks, Dijon mustard, lemon juice and hot sauce. Blend until smooth. 

In a small bowl, melt butter completely.

Turn the blender on low and slowly drizzle in hot, melted butter. The sauce should thicken. 

Pour the sauce into a bowl and nest the bowl inside a larger bowl filled with very hot water to keep the sauce warm.

Stack 2 slices on each plate. Sprinkle parsley and remaining Parmesan on top, then drizzle with Hollandaise Sauce and enjoy.